msi: Return the error from OpenSourceKey.

dlls/msi/source.c

@@ -617,7 +617,7 @@ UINT WINAPI MsiSourceListAddSourceExW( LPCWSTR szProduct, LPCWSTR szUserSid,
         rc = OpenSourceKey(szProduct, &sourcekey, MSICODE_PRODUCT, TRUE, FALSE);
 
     if (rc != ERROR_SUCCESS)
-        return ERROR_UNKNOWN_PRODUCT;
+        return rc;
 
     if (dwOptions & MSISOURCETYPE_NETWORK)
         rc = OpenNetworkSubkey(sourcekey, &typekey, TRUE);

dlls/msi/tests/source.c

@@ -410,10 +410,7 @@ static void test_MsiSourceListAddSourceEx(void)
     r = pMsiSourceListAddSourceExA(prodcode, usersid,
                                   MSIINSTALLCONTEXT_USERUNMANAGED,
                                   MSICODE_PRODUCT | MSISOURCETYPE_URL, "C:\\source", 0);
-    todo_wine
-    {
     ok(r == ERROR_BAD_CONFIGURATION, "Expected ERROR_BAD_CONFIGURATION, got %d\n", r);
-    }
 
     res = RegCreateKeyA(userkey, "SourceList", &url);
     ok(res == ERROR_SUCCESS, "Expected ERROR_SUCCESS, got %d\n", res);